key frame extractin i e representative frame

How to Extract key frame from the video. or the representative frame i e means i have set of video frame from those set of frames want to extract identical frames.

[msp]

any source code references?? please help

Answer 1

[Walter Roberson]

If all you have is the data frames decoded into video, it is not possible to determine afterwards which frames were key frames and which frames were Forward frames of Bidirectional frames. You need to have access to the encoded stream data to figure that out.

[msp]

any source code references?? please help